| RSRush Steel Supply Incorporated | El Centro | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SDSan Diego Refining CO | Escondido | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| SCSanta Clara Windustrial | Fremont | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SRSanta Rosa Lead Products LLC | Ontario | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SESapa Extruder, INC | City of Industry | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| SESaratoga Energy Research Partners | Berkeley | CA | Primary Metal Manufacturing331311 | — | ◇ UNVERIFIED |
 Schlosser Forge Company Rancho Plant #2 | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SSScott Schmitt | Rocklin | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| SISearing Ind | Rancho Cucamonga | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SPSeaward Products INC | Chatsworth | CA | Primary Metal Manufacturing331528 | — | ◇ UNVERIFIED |
| SBSequoia Brick | Lindsay | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| SESharon Escoto | Hesperia | CA | Primary Metal Manufacturing331529 | — | ◇ UNVERIFIED |
| SPShawcor Pipe Protection LLC. | Fontana | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
| SHS & H Welding INC Dba S & H Metals | Sacramento | CA | Primary Metal Manufacturing331491 | — | ◇ UNVERIFIED |
| SASierra Alloys Company | Azusa | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| SASierra Aluminum Architectural | Fontana | CA | Primary Metal Manufacturing331521 | — | ◇ UNVERIFIED |
| SASierra Aluminum Company | Fontana | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SASierra Aluminum, Div of Samuel, Son & CO | Riverside | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SASierra Aluninum Fontana Extrusion Operation | Fontana | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SDSierra Design & Manufacturing | Modesto | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SMSimonz Machine Dba Hyve Technologies | San Diego | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| SPSiva Power INC | Santa Clara | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SRSkees Recycling | Fresno | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
| SMSmart Machining, LLC | Santa Clara | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SWSmart Wires INC | Union City | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SSSmt Sales INC Dba Tom's Mobil Welding | Santa Paula | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| SMSnl-iov Montclair Owner LLC | Montclair | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
 So-cal Value Added LLC | Camarillo | CA | Primary Metal Manufacturing331318 | — | ◇ UNVERIFIED |
| SISolcoa Industries | Alameda | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| SESolo Enterprise CORP | City of Industry | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| SBSouth Bay Foundry INC | Santee | CA | Primary Metal Manufacturing331513 | — | ◇ UNVERIFIED |
| SMSpace Machining INC | San Jose | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SISparkz INC | Sacramento | CA | Primary Metal Manufacturing331313 | — | ◇ UNVERIFIED |
| SWSpingolo Warehouse Company | Stockton | CA | Primary Metal Manufacturing331315 | — | ◇ UNVERIFIED |
 Stang Industries INC | Corona | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| SMStar Metals, Inc. | Jurupa Valley | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SFSteel Flow Corporation | San Bernardino | CA | Primary Metal Manufacturing331420 | — | ◇ UNVERIFIED |
| SGStone Gryphon Tactical LLC | Chula Vista | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SIStrand Industries | Riverside | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| STStreuter Technologies INC | San Clemente | CA | Primary Metal Manufacturing331511 | — | ◇ UNVERIFIED |
| SISummit Iron Works Group INC | Gardena | CA | Primary Metal Manufacturing331210 | — | ◇ UNVERIFIED |
| SOSunrise of Carmichael | Carmichael | CA | Primary Metal Manufacturing331221 | — | ◇ UNVERIFIED |
| SISuperior Industries International INC | Van Nuys | CA | Primary Metal Manufacturing331524 | — | ◇ UNVERIFIED |
| TPTerrycable Products | Hesperia | CA | Primary Metal Manufacturing331222 | — | ◇ UNVERIFIED |
| TAThakar Aluminum CORP | Corona | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| TBThe Buyers INC | Santa Fe Springs | CA | Primary Metal Manufacturing331492 | — | ◇ UNVERIFIED |
| TCThe Carlstar Group LLC | Ontario | CA | Primary Metal Manufacturing331110 | — | ◇ UNVERIFIED |
 Thermal Equipment Corporation | Rancho Dominguez | CA | Primary Metal Manufacturing331512 | — | ◇ UNVERIFIED |
| TSThe Strelitz CO INC | Los Angeles | CA | Primary Metal Manufacturing331410 | — | ◇ UNVERIFIED |
| TMThorock Metals INC | Compton | CA | Primary Metal Manufacturing331314 | — | ◇ UNVERIFIED |
